Projected Assessment of System Adequacy (PASA) is a forecasting study. It is divided into Long, Medium, and Short Term PASA.

Long Term PASA (LT PASA) is undertaken by AEMO on an annual basis, as part of the publishing of the Electricity Statement of Opportunities (ESOO) for the Wholesale Electricity Market. This considers the 10-year planning horizon for generation, demand side programs, and network capacity.

The Short and Medium Term PASAs (ST PASA and MT PASA) are undertaken by System Management. The MT PASA details the system adequacy and generation requirements on a weekly basis for the three-year horizon, and is published monthly. The ST PASA details the system adequacy and generation requirements on a six-hourly basis for the three-week horizon, and is published weekly.